Flash Boys Chapter 3 - Ronan Ryan and the Telecom Secret Behind HFT
Every person I know who works in IT started from the bottom. Fixing cables, carrying equipment, dealing with angry users. Nobody hands you a corner office in tech. You earn it by touching the actual hardware. And that’s exactly why Ronan Ryan understood something that every Wall Street trader missed.
The Guy Who Didn’t Belong
Ronan Ryan did not look like a Wall Street trader. Lewis describes him as pale, narrow-shouldered, wiry. Like a guy who survived one potato famine and is expecting another. He couldn’t fake confidence the way Wall Street people do. He couldn’t pretend to know things he didn’t know.
Born in Dublin, he moved to America at sixteen. His father got sent by the Irish government to convince American companies to move to Ireland for tax benefits. Ireland back then was, as Ronan put it, “kind of like a shithole, to be honest.” His dad spent every last penny to rent a house in Greenwich, Connecticut. Ronan couldn’t believe it. Kids had their own cars at sixteen. Kids complained about riding a school bus. Ronan was amazed the bus even existed.
No fancy college. Fairfield University on a charity scholarship. After that, nobody on Wall Street wanted him. So he ended up in telecom. Not by choice. Because nobody else would take him.
Pagers, Fiber, and the Education Nobody Wanted
His first big job was delivering eight thousand pagers to a Wall Street firm for MCI. He sat in the back of a hot repair truck while angry traders screamed that the new pagers were terrible. One secretary called nearly crying because the pager was “too big” for her boss. Turned out the boss was very short. Welcome to Wall Street customer service.
But here’s the thing. While doing grunt work, Ronan learned the physical infrastructure of telecom. Where fiber optic cables went. How signals traveled. When someone first mentioned “milliseconds” to him, he said, “What the hell is a millisecond?” That knowledge turned out to be worth more than any MBA.
What Latency Actually Means
Latency is the time between when a signal is sent and when it arrives. Light in a vacuum goes 186,000 miles per second. Inside fiber, it bounces off walls and moves at about two-thirds of that speed. Still fast. But not instant. When you’re trying to trade stocks in milliseconds, every extra mile of cable matters.
Ronan understood this because he spent years running cables. He didn’t learn it from a textbook. He learned it by crawling through data centers.
Co-location and the Speed Arms Race
Around 2005-2007, every trading firm suddenly wanted their servers physically closer to the exchange’s matching engine. Not just in the same city. In the same building. As close as physically possible. This was co-location.
Ronan tells this amazing story. He was helping an HFT firm set up in a data center that used to be a Toys “R” Us. They demanded the old store logos stay on the building so nobody would know they were there. If one firm found a switch that was three microseconds faster, within two weeks every firm in the building had the same switch.
By 2007, Ronan was making hundreds of thousands a year building systems for faster trades. But he noticed the traders didn’t understand the technology. They’d say “I can see the difference!” about a three-millisecond improvement. Ronan would tell them, “That’s fifty times faster than a blink. There’s no way you saw anything.”
From Telecom to Trading Floor
Then Ronan got a call from RBC. In what he called “the quickest hiring in the history of Wall Street,” he got offered a job. Head of High-Frequency Trading Strategies. Paid $125,000, about a third of what he was making selling speed to HFT firms.
His wife asked: “What are you going to do for them?” Ronan had no idea. But he’d always wanted to work on a real Wall Street trading floor. He took the pay cut without thinking twice.
The Map That Changed Everything
Ronan brought in oversized maps of New Jersey showing the fiber optic networks. When he unrolled the first map, a guy from RBC’s network team yelled, “How the fuck did you get those? They’re telecom property!” Ronan just shrugged. He was the telecom guy.
Those maps explained everything. Orders from Brad’s desk arrived at different exchanges at different times because some were physically farther away. The fastest an HFT signal could travel between exchanges was 465 microseconds. One two-hundredths of a blink.
So here’s what happened. High-frequency traders had servers co-located right next to the exchanges. Brad’s orders hit the closest exchange first. HFT firms saw that order, raced ahead to other exchanges, bought up the stock before Brad’s order arrived. Then sold it back at a higher price. Every single time.
Ronan could see this because he understood the physical wires. The traders couldn’t because they lived in the world of screens and numbers.
The Road Show Nobody Expected
Brad and Ronan started meeting with investors. Hundreds of them. Fidelity, Vanguard, T. Rowe Price, hedge funds run by David Einhorn and Bill Ackman. None of them knew what was happening. No PowerPoint. They just sat down and explained things in plain language.
Ronan was surprised by how ordinary Wall Street people were. “It’s a whole industry of bullshit,” he said. He’d ask, “Do you know what co-location is?” They’d say yes. Then he’d explain it and they’d go, “What the fuck? That’s got to be illegal!”
Because Ronan looked nothing like a Wall Street person, people trusted him. One investor looked at this unlikely pair, a Canadian Asian guy from a bank nobody cared about and an Irish guy doing a fair impression of a Dublin handyman, and said: “Your biggest competitive advantage is that you don’t want to fuck me.”
The Flash Crash Connection
Then came the flash crash. May 6, 2010. Market dropped 600 points in minutes. Procter & Gamble traded as low as a penny. The SEC blamed one sell order from Kansas City. But their report tracked time in minutes and seconds. The market was moving in microseconds. Brad searched the report: “minute” got 87 hits, “microsecond” got zero.
The regulators could not see what was happening because their clocks were too slow. After the flash crash, Brad’s phone rang off the hook. People were finally ready to listen.
My Take
This chapter is where the puzzle comes together. Brad knew something was wrong with his trades but didn’t know why. Ronan knew why, because he knew the physical layer. The cables, the distances, the speed of light. Put these two together and suddenly the whole scam becomes visible.
I spent years working with networks and infrastructure. The people who build the pipes always understand the system better than the people who just use it. The traders with fancy suits and MBAs couldn’t figure out what a telecom guy from Dublin saw in five minutes.
The dark pools, the exchange rebates, the co-location, the special order types. All built on one simple fact: information moves through physical wires, and whoever controls those wires controls the market.
And that’s what makes this chapter so good. It’s not about money or algorithms. It’s about a guy who knew where the cables went.
This is part of my chapter-by-chapter retelling of “Flash Boys: A Wall Street Revolt” by Michael Lewis (ISBN: 978-0393244663). I’m retelling the story in my own words with my own thoughts mixed in.
Previous: Chapter 2 - Brad’s Problem